"Once he is completely integrated we will see even more of him, but he has shown today that he is a great player," said Wenger said.
"Ozil is a player, when you look at his numbers, the assists are not a coincidence, it is just the reality of his game.
"You could see today he has a good pace as well. At the moment he focuses a lot on his passing, but he can create individually as well."
Tottenham needed a moment of magic from Paulinho, one of several new signings, as the Brazil midfielder backheeled the winner at Cardiff from Erik Lamela's pass.
"There could only be one winner," said Spurs coach Andre Villas-Boas.
"We played so much football it would have been unfair to leave here with only one point."
In Sunday's other match, Swansea moved up to ninth with a 2-0 win at promoted Crystal Palace, which stayed second from bottom.
Bottom club Sunderland sacked coach Paolo Di Canio on Sunday, following a 3-0 defeat against West Brom 24 hours earlier.
The Italian was a controversial appointment on March 31 due to his past statements in support of fascism, but he kept the club in the top flight in 17th place.
However, Sunderland has just one point from five games this season.